Answer:
y = 8
Step-by-step explanation:
for the triangles to be congruent, 2y + 20 must equal 36.
2y + 20 = 36
subtract 20 from each side of the equation:
2y = 16
divide both sides by 2:
30 and 13
x-y=17 and x+y=43
x=17+y and x=43-y, so 17+y=43-y
so y=13
43-13=30, so x=30 and y=13
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